Kylie Minogue, Sir Tom Jones, Will.i.am and Ricky Wilson have helped launch a new series of The Voice - and admitted that winning the show will not guarantee stardom.
The third series of the BBC1 show features new coaches Minogue and Kaiser Chiefs frontman Wilson joining the line-up.
The pair replace Jessie J and Danny O'Donoghue in the contest, known for its trademark swivel chairs and blind auditions.
Previous winners have failed to make a big splash in the music world.
But Sir Tom said at today's launch at London's New Broadcasting House that singers had already walked through one door by getting on to the show.
Referring to the likes of The X Factor, which has been criticised for featuring some contestants who are deluded about their talents, he said: "No-one is going to say 'what was that all that about?'
"But there is no guarantee. There's no guarantee in showbusiness. It's one step at a time. It's always down to the public whether that person is going to be a star."
He added: "You've got to try and get all the ingredients and hopefully it will sell. There's no guarantee that if you win this, you will be a star."
In an apparent dig at The X Factor, Wilson added: "If you want to see people making fools of themselves you can go to other stations."
He also hinted that the new series of The Voice featured some format changes.
Minogue, who was approached to join the first series but turned it down, said that she was "really comfortable" being the only woman on the panel because it "stops any stories about bitchiness and cattiness."
She paid tribute to her predecessor Jessie J, praising her voice and character and adding: "I hope Jessie enjoys seeing me in her seat."
Will.i.am said that it was "not fair" to compare the two coaches but said of Minogue: "She's reached a level of success that we all want to have. The show needs a Kylie."
He said a flaw in the show was that there was no record company championing the singers after the series ended.
The new series features sees The Streets singer Leo Ihenacho and a vocalist who is also an impersonator of Ruth Jones' Gavin and Stacey character Nessa try their luck.